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area of northern operations |
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A region of variable width in the Northern Hemisphere that lies north of the 50 degrees isotherm--a line along which the average temperature of the warmest 4-month period of the year does not exceed 50 degrees Fahrenheit. Mountain regions located outside of this area are included in this category of operations provided these same temperature conditions exist. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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